Automatic torque adjusting cutter

A cutter comprising a body provided with a cutting blade rotating vertically by a motor arranged so as to move vertically and to be inclined within 45 degrees in a right and left direction, respectively, on a base on which a workpiece is placed, and an automatic torque adjusting mechanism arranged between an output shaft of the motor and a spindle to which the cutting blade is fixed, and that automatically adjusts torque transmitted from the output shaft to the spindle according to a load in rotating of the cutting blade, wherein

• at least two intermediate shafts are provided between the output shaft and the spindle,
• the automatic torque adjusting mechanism is arranged between the output shaft and the intermediate shafts which are located just behind the output shaft,
• the automatic torque adjusting mechanism comprises:
• a driving pulley arranged in the output shaft and having a pair of pulley plates with the distance therebetween being adjustable,
• a driven pulley arranged in the spindle just behind the output shaft and having a pair of pulley plates with the distance therebetween being adjustable according to the load, and
• an endless belt stretched between the driving pulley and the driven pulley, wherein torque is adjusted when the driven pulley changes the distance between the pulley plates according to the load to change a position of the belt continuously, and thereby the driving pulley changes the distance between the pulley plates through the belt to change a winding position of the belt continuously, and
• the intermediate shaft is located just in front of the spindle and is arranged above the spindle, and a lower end of the pulley plate of the driven pulley is arranged above the intermediate shaft located just in front of the spindle.